Ukraine

The Ukraine\Russia-related sanctions program represents the implementation of multiple legal authorities. Some of these authorities are in the form of an executive order issued by the President. Other authorities are public laws (statutes) passed by The Congress. These authorities are further codified by OFAC in its regulations which are published the Code of Federal Regulations (CFR).

Source: https://www.treasury.gov/resource-center/sanctions/Programs/Pages/ukraine.aspx